I have operated a car buying service '48 Hours And A Used Car' for nearly seven years now. I used to own part of an auto auction, was a remarketing manager for Capital One, and have owned a dealership here in Atlanta for well over 20 years.
Long story short, unless you have rust or some other terminal issue it's better to invest in what you have. The long-term reliability of late model used cars has become far worse over the past decade. CVT's, direct injection engines, small turbos, cheaper interior materials, and the ever dwindling number of vehicles available have turned a lot of today's market into a no-no nadir.
If you decide to invest about $2000 on your current vehicle with the goal of keeping it another three to five years you will be way better off. By then Tesla will have released their Model 2, Toyota will begin mass production of their solid state batteries, and most other automakers will have a large amount of options when it comes to the heavily subsidized EV market.
That will be the next pot at the end of the automotive rainbow. As TLC said, "Don't go chasing waterfalls!"
All the best
Steven Lang